iarticle-tgtimes-what-on-mars.mw - tgtimes - The Gopher Times	Err	bitreich.org	70
hgit clone git://bitreich.org/tgtimes git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/tgtimes	URL:git://bitreich.org/tgtimes git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/tgtimes	bitreich.org	70
1Log	/scm/tgtimes/log.gph	bitreich.org	70
1Files	/scm/tgtimes/files.gph	bitreich.org	70
1Refs	/scm/tgtimes/refs.gph	bitreich.org	70
1Tags	/scm/tgtimes/tag	bitreich.org	70
1README	/scm/tgtimes/file/README.md.gph	bitreich.org	70
i---	Err	bitreich.org	70
iarticle-tgtimes-what-on-mars.mw (2278B)	Err	bitreich.org	70
i---	Err	bitreich.org	70
i     1 .SH tgtimes	Err	bitreich.org	70
i     2 What really happened on Mars?	Err	bitreich.org	70
i     3 .2C 34v	Err	bitreich.org	70
i     4 .	Err	bitreich.org	70
i     5 .PP	Err	bitreich.org	70
i     6 What can possibly go wrong while sending a device entirely controlled	Err	bitreich.org	70
i     7 by software on a remote location where noone would ever be able to	Err	bitreich.org	70
i     8 go for a long while? The question opens a vast field of answers.	Err	bitreich.org	70
i     9 .	Err	bitreich.org	70
i    10 .PP	Err	bitreich.org	70
i    11 1997, Pathfinder, a solar-powered ground lander and station, with	Err	bitreich.org	70
i    12 VxWorks proprietary real time operating system onboard, embedding	Err	bitreich.org	70
i    13 an 6-wheeled Sojourner rover with custom firmware, landed on Mars.	Err	bitreich.org	70
i    14 .	Err	bitreich.org	70
i    15 .PP	Err	bitreich.org	70
i    16 During a field data collection mission a priority inversion did	Err	bitreich.org	70
i    17 happen on the Pathfinder station total loss of control for the time	Err	bitreich.org	70
i    18 of a reboot.	Err	bitreich.org	70
i    19 .	Err	bitreich.org	70
i    20 .PP	Err	bitreich.org	70
i    21 The bug was reproduced on earth and patched, latter explained on a	Err	bitreich.org	70
i    22 mailing list, published online.	Err	bitreich.org	70
i    23 .	Err	bitreich.org	70
i    24 .FS	Err	bitreich.org	70
i    25 https://www.cs.unc.edu/~anderson/teach/comp790/papers/mars_pathfinder_long_version.html	Err	bitreich.org	70
i    26 .FE	Err	bitreich.org	70
i    27 .	Err	bitreich.org	70
i    28 .PP	Err	bitreich.org	70
i    29 At its core, most operating systems are built around a scheduler	Err	bitreich.org	70
i    30 that orchestrates execution of many tasks onto one or several CPUs.	Err	bitreich.org	70
i    31 It is a critical piece of software in the case of real-time operating	Err	bitreich.org	70
i    32 systems, that must ensure to trigger some actions right on time.	Err	bitreich.org	70
i    33 .	Err	bitreich.org	70
i    34 .PP	Err	bitreich.org	70
i    35 Complex systems may be unfit for such purposes, and software	Err	bitreich.org	70
i    36 simplicity has found its way through experimenting how complex	Err	bitreich.org	70
i    37 systems may end-up in difficult-to-debug situations.	Err	bitreich.org	70
i    38 .	Err	bitreich.org	70
i    39 .PP	Err	bitreich.org	70
i    40 Imagine yourself in charge of reproducing a bug on earth for	Err	bitreich.org	70
i    41 something that went wrong on another planet, with a patch expected	Err	bitreich.org	70
i    42 for next Monday. A strong argument toward keeping systems simple	Err	bitreich.org	70
i    43 and easier to debug.	Err	bitreich.org	70
i    44 .	Err	bitreich.org	70
i    45 .PP	Err	bitreich.org	70
i    46 Although, the Mars operating system landscape is not all VxWorks and	Err	bitreich.org	70
i    47 nothing else. For instance, the RTEMS system, Real-Time Executive	Err	bitreich.org	70
i    48 for Multiprocessor Systems was open-sourced from US army 1993 and is	Err	bitreich.org	70
i    49 today actively maintained by both corporations and the open source	Err	bitreich.org	70
i    50 community.	Err	bitreich.org	70
i    51 .	Err	bitreich.org	70
i    52 .PP	Err	bitreich.org	70
i    53 Being part of Google Summer of Code, it is also welcoming newcomers	Err	bitreich.org	70
i    54 to real-time operating system development, who might be able to	Err	bitreich.org	70
i    55 contribute to embedded software making its way onto space.	Err	bitreich.org	70
i    56 .	Err	bitreich.org	70
i    57 .FS	Err	bitreich.org	70
i    58 https://www.rtems.org/	Err	bitreich.org	70
i    59 .FE	Err	bitreich.org	70
i    60 .	Err	bitreich.org	70
i    61 .PP	Err	bitreich.org	70
i    62 While the ISS project was put at threat by the current events in	Err	bitreich.org	70
i    63 Ukraine involving all nations, outter-space still represents a middle	Err	bitreich.org	70
i    64 ground where all sides have a same objective and can collaborate:	Err	bitreich.org	70
i    65 extending the horizons above what could be reached before.	Err	bitreich.org	70
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